 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal;

 import org.eclipse.core.runtime.IConfigurationElement;
 import org.eclipse.core.runtime.IExtensionRegistry;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.internal.registry.IWorkbenchRegistryConstants;
 import org.eclipse.ui.internal.registry.RegistryReader;

 /**
  * This reader loads the popup menu manager with all the
  * popup menu contributors found in the workbench registry.
  */
 public class ObjectActionContributorReader extends RegistryReader {

     private ObjectActionContributorManager manager;

     /**
      * Creates popup menu contributor from this element.
      */
     protected void processObjectContribution(IConfigurationElement element) {
         String objectClassName = element.getAttribute(IWorkbenchRegistryConstants.ATT_OBJECTCLASS);
         if (objectClassName == null) {
             logMissingAttribute(element, IWorkbenchRegistryConstants.ATT_OBJECTCLASS);
             return;
         }

         IObjectContributor contributor = new ObjectActionContributor(element);
         manager.registerContributor(contributor, objectClassName);
     }

     /**
      * Implements abstract method to handle configuration elements.
      */
     protected boolean readElement(IConfigurationElement element) {
         String tagName = element.getName();
         if (tagName.equals(IWorkbenchRegistryConstants.TAG_OBJECT_CONTRIBUTION)) {
             processObjectContribution(element);
             return true;
         }
         if (tagName.equals(IWorkbenchRegistryConstants.TAG_VIEWER_CONTRIBUTION)) {
             return true;
         }

         return false;
     }

     /**
      * Reads the registry and registers popup menu contributors
      * found there.
      *
      * @param mng the manager to read into
      */
     public void readPopupContributors(ObjectActionContributorManager mng) {
         setManager(mng);
         IExtensionRegistry registry = Platform.getExtensionRegistry();
         readRegistry(registry, PlatformUI.PLUGIN_ID,
                 IWorkbenchRegistryConstants.PL_POPUP_MENU);
     }

     /**
      * Set the manager to read into.
      *
      * @param mng the manager
      */
     public void setManager(ObjectActionContributorManager mng) {
         manager = mng;
     }
 }

